package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.conditions.query.LambdaQueryChainWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    /**
     * 根据id删除分类，删除之前需要进行判断
     * @param ids
     */
    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;
    @Override
    public void move(Long ids) {
        //1：查询当前分类是否关联了菜品,如果已关联,抛出一个业务异常
        LambdaQueryWrapper<Dish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(Dish::getCategoryId,ids);
        int count1 = dishService.count(lambdaQueryWrapper);
        //1.1如果count大于1，说明分类与菜品关联,抛出一个业务异常
        if (count1>0){
          throw new CustomException("当前分类下关联了菜品,不能删除");
        }
        //2：查询当前分类是否关联了套餐,如果已关联,抛出一个业务异常
        LambdaQueryWrapper<Setmeal> lambdaQueryWrapper1 = new LambdaQueryWrapper<>();
        lambdaQueryWrapper1.eq(Setmeal::getCategoryId,ids);
        int count2 = setmealService.count(lambdaQueryWrapper1);
        if (count2>0){
         throw new CustomException("当前分类下关联了套餐,不能删除");
        }
        //3：正常删除分类
        this.removeById(ids);
    }
}
